Mechanical motion.



PATENTED 0ST. 8. 1907.

HQ A. BALLARD.

MECHANICAL MOTION.

APPLIOL'IIOI FILED JAR. 24.1905.

CUjimeas es 7 Mac Mm (Pa M U T D srrrrns, PATENT ()FFICEL sienna A. BALLA on, or ASlllrAND, MASSACHUSETTS, ASSIGNOR, BY M'ESNE ASSIGNMENTS,

TO THE BOYLSTUN MANUFAOflURING COMPANY, 01" BOSTON, MASSACHUSETTS, A COR- PORATION NEW JERSEY.

. MECHANICAL MOTION.

To all whom it may concern: 1

Edit known that I, HArmin A. BALLARD, of Ashland, in the county of Middlesex and State of Massa'ch usctts, have invented certain new and useful Imptovcments in Mechanical Motions, of which the following is a specification.

This invention is a novel form or" mechanical motion and al though especially adapted for the looper mechanism of a shoe-sewing machine, as illustrated in my copending application, Serial No. 242,489 filed January 24, 1905, it may be modified in many ways to be adaptable to various other machines.

he prime object of the invention is to con'vert'continuous rotary motion into intermittent rotary motion 1 having a counter motion.

Inthc form illustrated upon the accompanying drawings, a counter-shaft is interposed between the drivingrnember and the member for which the motion is intended, and inasmuch as the operated member is geared to rotate twiceior each revolution of the counter-shaft, the ratio of the driving member and counter-shaft is made correspondingly inverse. The purpose for which this embodiment of the invention iscspecially adapted is to impart to the operated member continuous rotary motion to the extent of one revolution and 180 degrees of another, followed by a dwell, and'then 180 degrees rotation in the'opposite direction, followed by a dwell, during'each complete cycle of the driving-member.

The relation of the counter-shaft to the d riving-mem- 33 her, and to the operated member, may be varied in many ways, according to the availablespace and distribution of parts without departing from the spirit and scope of the invention. p

On theaccompanying drawings, forming part of this specification,----Figu1'e,l shows in side elevation an intermittent driving mechanism in connection with a.

looper. Fig. 2 is an enlarged view of the operative portion oflthe coacting gear members, from the point indicated by the arrow 2. Fig. 3 is a similar view of the 4d reversing portions of the coaeting gear members. Fig. 4. is a side elevation of the portions included in Fig.2. Fig. 5 is a development of the face of the driving-memher. Fig. 6 is a development of the face of the coacting .r lr iven n1ember. i

The same reference characters indicate the same parts, wherever they oc cur.

In describing the present embodiment of the inVen tion, it may he stated that the object into provide, i-nstead of the usual levers, cams and springs, which usushoe-sewing machine mechanism which shall accomplish the dvs'ired result, and which vshall he clieaper, simpler, fighter, and of bulk thanthose heretofore ally'constitute the looper-mechanism of a chainrstitch' Specification of Letters Patent. Application filed January 24?, 1905. Serial No. 242,490. n

Patented Oct. 8, 1907.

employed. In carrying out this embodiment of the invention, a bodily immovable rotary looper has been developed. It is well known, by those familiar with the shoe-sewing machines that in forming each stitch the looper necessarily describes one turn aronnd the barb of the needle. Various distributions of this motion-are employed in various styles of machines, and the motion designed ior'the loopor herein sl'low'n has already been described. l j

In Fig. 1 the looper, indicated at 11, is aihiacd to thelower end of a stem 10, which is preferably hollow, so that the thread may pass through it to the looper. The stem 10 is adapted to be supported by and to rotate in a fixed bearing provided by a suitable bracket, not shown. A spiral gear 12 affixed to the stem, interrncslies with a spiral gear 13 affixed to a countcrshal't 14.

Said countershait is mounted in suitable fixed hearings 15 15 and extends from front to rear of the machine. It u may be here stated that the gear 13 has twice as many teeth as the gear 12, although this ratio maybe varied for various purposes. Attached to the shaft 14 is a gear 16,- Wlii'ch may be termed a cross-cut mutilated spiral gear. Said gear intermeshes with and is driven by a gear 17 atfixed to a power shaft 18 on a different plane and transversely of the shaft-14.

The gear 17 comprises a segment A of spiral teeth of I rigllt-hand'pitch and a segment B of spiral teeth of left-hand pitch connectedby a peripheral flange or fin 19 on one side of the axis and a fin 20 on the opposite side thereof. The fin 19 is adapted to enter either of two diametrically opposite grooves 21' in the face of the gear 16 and parallel to the axis thereof, and the fin 20 is likewise adapted to enter either of two diametrically oppositegrooves 22 midway between the grooves 21. The gear 16 thus becomes interlocked with the gear 17 without preventing the rotation of the latter. The periphery of the gear 16 isdivided by the grooves 21 21, 22 22, into four equal divisions in ac and y y. As previously stated, the number and length-of the coaet; ing portions of the gears 16 and 17 may be varied in many ways, and so it must be remembered that, although the present description deals with only one form, the distribution of coacting portions of the two gears is arbitrary. I 5 In Fig. 6 the relative locations of the y y, and the grooves 2121, 22 22,,18- best shown. It will be seen that the portions z :1 comprise simple spiral teeth of right-hand pitch,--adapted to interrnesli with only the'segment A of right-hand'pitch. The portions 31 y comprise equidistant pegs 5, the remainfiig stockof spiral teeth after having been cut at right'an glos to their original pitch, thus being adapted. to inter- '-.n1esh wi th coacting portions of either right or left-hand portions :c-x, 

